I have alot of custom meta boxes, and the user has to scroll to the top everytime he wants to save the meta info.
Is there a way to put submit buttons at every meta box that does that same as the update button?
Don't know if i agree with EarnestoDev answer which is more of an opinion then an answer based on facts and not true in all cases, since you can use jQuery to trigger the submit event when a different element is clicked, so just add this js code once
and in each metabox add:
DON'T DO IT! There's reasons why FORMs have centralized submits. Because there's some processing done behind the screen and one button is safe. Having an extra button in all your Metaboxes will also take up more space.
The easier you make it for the user to press the button, the safer it is to bet he'll forget something. The more difficult it is to submit a post, the more sure you can be he'll review stuff properly.
One button = IMPORTANT. Many buttons = importance demotion.